Stealth technology in aviation has been perfected by the United States by complementing it's arsenal with three dramatic aircraft: The secret Northrop Grumman B-2 Spirit, the feared Lockheed Martin F-22A Raptor and the eagerly awaited Lockheed Martin F-35 Lightning 11. Calvendo calendars are premium products - a bit more pricey than others but with added benefits: Our calendars always look beautiful on your wall because we produce them locally with premium paper and sophisticated spiral binding, ensuring easy turning of pages and flat hanging against the wall. A protective transparent plastic cover sheet provides added stability. Treat yourself to a Calvendo calendar and you get something that looks better all year round.